Hemstitch sewing-machine.



O. M. ABERGROMBIE;

HEMSTITGH SEWING MACHINE.

APPLICATION FILED NOV.11,1910.

Patented Dec. 19, 1911.

2 SHEETSSHEBT 1.

I/l/l TNESSES:

BY iii (DIM A TTORNEY G. M. ABERGROMBIE.

HEMSTITOH SEWING MACHINE. APPLIOATIQN FILED NOV.11,1910.

1,012,182, Patented Dec. 19, 1911.

2 SHEETS-SHEET 2.

A TTORNEY UNITED STATES PATENT OFFICE.

CHARLES M. ABERCROMBIE, OF BRIDGEPOB'I, CONNECTICUT, ASSIGNOR TO SINGERMANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

HEMSTITCH SEWING-MACHINE.

' Patented Dec. 19, 1911.

Serial No. 591,754.

To all whom it may concern:

Be it known that I, CHARLES M. ABER- CROMBIE, a citizen of the UnitedStates, residing at Bridgeport, in the county of Fairfield and State ofConnecticut, have invented certain new and useful Improvements inHemstitch Sewing-Machines, of which the following is a specification,reference being had therein to the accompanying drawings.

This invention relates to improvements in hemstitch sewing machinesemploying a loop-taker having movements in a given horizontal plane anda counter-shaft journaled in the standard of the overhanging arm, saidcounter-shaftbeing arranged parallel with and operated from the mainshaft of the sewing machine and carrying the elements for positioningthe needle in different vertical planes and for giving to the feeddogits vertical and oppositely directed feed movements.

Some of the earlier forms of the above referred to type of sewingmachines were intended to meet the requirements of high speed but, owingto the disadvantages arising from integrally combining certain elementswhich should be capable of individual adjustment and separatelyconstructing other elements which should be integrally formed orpermanently secured against relative adjustment, they have failed tomeet the demand of high speed.

The object of the present invention is to construct and arrange theneedle-vibrating, feed-dog-actuating and stitch-forming mechanisms so asto remedy these defects and give to the construction as a whole theutility required for effecting high speed (2800 to 3000 stitches perminute), and to this end the prime members for actuating the feed-dogare integrally combined, those of the needle vibrating mechanism arecapable of adjustment with respect to the former members, and thesevarious members are adjustable with respect to the stitch-formingmechanism.

In the accompanying drawings illustrating the invention, in the severalfigures of which like parts are similarly designated, Figure 1 is a viewin elevation, partially in full lines and partially in section, of ahemstitch sewing machine of the herein de scribed improved type. Fig. 2is an underside view of the machine shown in Fig. 1. Fig. 3 is asectional view, in. elevation,

through the bracket arm standard. Fig. 4 1s a view of the needlethreadtake-up and its directly connected actuating elements, togetherwith the needle-bar link and a part of the needle-bar. Fig. 5 is a topplan view of the elements shown in Fig. 4. Fig. 6 isa view inperspective of the feed-actuating lever, together with certain directlyconnected elements later to be referred to. Fig. 7 is a view of-theneedle-vibrating cam, the shaft operatively connected with said cam, andthe elements carried by said shaft, together wlth views in cross-sectionof the main shaft, counter-shaft and bracket arm.

1 represents the bed-plate of the sewing machine, 2 the bracket armprovided with the head 3 and standard 4, 5 the main orneedle-bar-driving shaft mounted in suitable bearings formed in thebracket arm and provided with the driving pulley 6, shaft flange 7 andbelt-driving pulley 8.

9 is the needle-bar provided at its lower end with a bracket 10 uponwhich is pivoted, by screw 11, the needle-carrying bracket 12 which, inturn, has secured to it the lower end of a rod 13, the opposite end ofsaid rod being connected by a swivel joint 14 to the needle-vibratingconnection 15, said needlebar deriving its vertical movements throughthe attached needle-bar-driving link 16 fulcrumed at its upper end upona stud 17 which is secured by screw 18 in the shaft flange 7 The stud 17and arm 19 are formed integral and carry a roller 20 which coacts with acam-groove 21 formed in the take-up lever 22- to give to the latter therequired movements for controlling the needle thread and for tighteningthe stitch, said take-up lever being fulcrumed on a stud 23 which issecured by screw 24 in a bracket 25 formed integral with the rear sidewall of the head 3, the opposite end of said take-up lever havingsecured to it, by screws 26, 26, a finger 27 provided with a threadeye28.

29 represents a pinch collar carried by the needle-bar and provided withan extended forked portion 30 which coacts with the flattened portion ofthe rod 31 secured by screw 32, to hold the needle-bar against axialmovement.

33 represents the loop-taker-driving shaft mounted in suitable bearingsbelow the bedplate of the sewing machine and operatively connected, bythe belt 34, with the main shaft 5 in a manner to give to said lowershaft two revolutions to one revolution of said main shaft. The shaft 33at its for ward end carries a gear pinion 35 which meshes with a likepinion 36 carried by the loop-taker shaft 87. The shaft 37 is mounted ina bracket 38 which is secured by screws 89, 39 to the bed-plate 1, theopposite end of said shaft having secured upon it one form ofcommonly-employed looptaker (not shown).

40 represents the feed-bar provided at its upper side with the usualserrated feed-dog (not shown) and connected at its rear end, by screwbolt 41 and arm 42, with the feed rock-shaft 43, which latter at itsopposite end is operatively connected with the feedconnection 44,through the arm 45 and stud bolt 46.

47 is the feed-lift rock-shaft which is connected at its forward end, bythe arm 48, stud 49 and slide block 50, with the forked end of thefeedbar 40, the opposite end of said shaft being connected with thefeed-lift rock-shaft connection 51 through the pinch bracket 52 and stud53.

54 represents a rod loosely mounted in suitable bearings formed in thearm standard, and upon said rod is secured, by screw 55, thefeed-adjusting lever 56 provided with a threaded extension 57 whichpasses through a slot 58, formed in said arm standard, and is providedwith a knurled head 59, the latter, when drawn in by the action of thescrew thread, acting to confine the washer 60 between it and the curvedportion 61, thereby holding said rod against movement except when it isdesired to readjust the length of the stitch.

62 is an arm secured at one end, by screw 63, to the rod 54, itsopposite end being pivotally attached to one end of a link 64, theopposite end of which latter is pivotally attached to the feedconnection 44, thus, through the adjustment of the lever 56, effectingadjustments of said feed connection on the stud bolt 46.

65 represents the feed rock-lever provided with the shaft 66, the latterbeing mounted to oscillate in a cup-shaped bushing 67 secured by screw68 in the hub 69 which forms a part of the standard 4. Secured to theshaft 66, by screw 70, is a follower 71 which oscillates in an opening72 formed in said bushing, thus permitting adjustments of the feedrock-lever in the direction of the length of its shaft by an adjustmentof said bushing to accommodate the working position of the feed-cam,later to be referred to, said follower acting to maintain a uniformrelationship between said bushing and said rock-lever. The bushing 67also comprises a hearing which is closed against the dripping of oilfrom the outer end of the shaft 66. To prevent the soiling of the fabricthrough contact with the follower 71, there is provided a circularspring washer 73 which lies directly over and closes the opening 72,except when adjusted to a position convenient for oiling the shaft 66.

The rock-lever 65 comprises transversely arranged arms 74 and 7 5. Thearm 74 is provided at its free end with a roller 76 which tracks thefeed-cam groove 7 7 formed in the feed-cam '78, secured by screws 79upon the counter-shaft 80. The shaft 80 is mounted at one end in acup-shaped bushing 81 secured by screw 82 in the arm standard, and atitsopposite end in a bearing formed in the bracket 83 extending inwardlyfrom the inner front wall of said standard.

Upon the mainshaft 5 is mounted a gear wheel 84 which coacts with thegear teeth 85 formed on the periphery of the feed-cam 78 to transmitmotion to the counter-shaft 80, the ratio of said gears being as one tothree, thus giving to said feed-cam one rotation to three rotations ofsaid main shaft, as is common in the construction of heinstitch sewingmachines. The arm 7 5 of the rock-lever 65 is provided with a guidemember 86 having an under-cut groove 87, later to be referred to.

To the upper end of the feed-connection 44 is pivotally secured by screw88 a follower 89 provided with a guideway 90 and guidepin 91, saidguide-way coacting with the guide member 86 to direct said follower inits adjustment toward and away from the axis of the shaft 66, and saidguide-pin coacting with the under-cut groove 87 to hold said follower inalinement with said guide member, it being understood that theadjustment of the follower 89, through the connected elements previouslypointed out, determines the amplitude of the feed movement-s; and as iscommon to sewing machines of this class, the cam-groove 77 is formed soas to effect one backward and two forward feed movements for eachhemstitch figure.

The feed-cam 7 8 is provided with a camgroove 92 in which tracks afollower 93 mounted on a stud screw 94 secured in the upper end of thefeed-lift rockshaft connection 51, whereby vertical movements aretransmitted from said cam-groove to the feed-bar 40, through theconnections 51, 52, 47 and 48. To maintain the follower 93 in properrelationship with its coacting camgroove, the counter-shaft 80 isprovided with a loosely mounted guide-block 95 which coacts with theforked end 96 of the suitable bearings formed in the bracket arm, saidcrank shaft carrying at one end a segment lever 100 to which theneedle-vibrating connection 15 is adjustably secured, and at itsopposite end a crank arm 101 provided with a roller 102 which tracks thecam-groove 98, the latter, through the connections previously pointedout, causing the needle to descend in different vertical planes, in amanner common to hemstitch sewing machines.

It has not been deemed necessary to illustrate or describe theclothresser mechanism employed in connection with the presentconstruction, as it is the same as that commonly employed in connectionwith hemstitching.

Claims 1. In a hemstitch sewing machine, a stitchforming andcloth-feeding mechanism including a main shaft, an eye pointed needle, afeed-bar, feed and feed-lift rock-shafts operatively connected with saidfeed-bar, a counter-shaft mounted in the bracket arm standard and gearedto said main shaft, a feed-cam carried by said counter-shaft andprovided with cam-grooves, connections between the latter and said feedand feed-lift rock-shafts, a needle-vibrating cam carried by saidcounter-shaft and adjustable with respect to the working position ofsaid feedcam, and connections between said needlevibrating cam and saideye pointed needle including a crank-arm housed within the sewingmachine bracket-arm and provided with a cam follower.

2. In a hemstitch sewing machine, a stitchforming and cloth-feedingmechanism including a main shaft, an eye pointed needle, a feed-bar,feed and feed-lift rock-shafts operatively connected with said feed-bar,a counter-shaft mounted in the bracket arm standard parallel to andoperatively connected with said main shaft, a feed-cam carried by saidcounter-shaft and provided with cam-grooves, connections between thelatter and said feed and feed-lift rock shafts, a needle-vibrating camcarried by said counter-shaft and adjustable with respect to the workingposition of said feedcam, and connections between said needle-vibratingcam and said eye pointed needle including a crank shaft having its axisarranged transverse to the axis of said main shaft;

3. In a hemstitch sewing machine, a stitchforming and cloth-feedingmechanism including a main shaft, an eye pointed needle, a feed-bar,feed and feed-lift rock-shafts operatively connected with said feed-bar,a counter-shaft mounted in the bracket arm standard and geared to saidmain shaft, a feed-cam carried by said counter-shaftand provided withcam-grooves, connections between the latter and said feed and feed-liftrock-shafts including a feed-lift rock-shaft connection forked at itsupper end and operatively connected with a guide block loosely mountedupon said counter shaft, a needle-vibrating cam carried by saidcounter-shaft and adjustable with respect to the working position ofsaid feed-cam, and connections between said needle-vibrating cam andsaid eye pointed needle. I

4:. In a hemstitch sewing machine, a stitchforming and cloth-feedingmechanism including a main shaft, an eye pointed needle, a feed-bar,feed and feed-lift rock-shafts operatively connected with said feed-bar,a counter-shaft mounted in the bracket arm standard and geared to saidmain shaft, a feed-cam carried by said counter-shaft and provided withcam grooves, connections between the latter and said feed and feed-liftrock-shafts including a feed rock-lever mounted to oscillate in an adjustably secured cup-shaped bearing and held against adjustmentindependent of said bearing, a needlevibrating cam carried by saidcounter-shaft and adjustable with respect to the working position ofsaid feed-cam, and connections between said needle-vibrating cam andsaid eye pointed needle.

5. In a hemstitch sewing machine, a stitchforming and cloth-feedingmechanism including a main shaft, an eye pointed needle, a feed-bar,feed and feed-lift rock-shafts operatively connected with said feed-bar,a counter-shaft mounted in the bracket arm standard and geared to saidmain shaft, a feed-cam carried by said counter-shaft and provided withcam-grooves, connections between the latter and said feed and feed-liftrock-shafts including a follower provided with a guide-way and aguide-pin, and a feed rock-shaft provided with a guide member having anunder-cut groove into which said guide-pin projects, a needle-vibratingcam carried by said counter-shaft and adj ustable with respect to theworking position of said feed-cam, and connections between saidneedle-vibrating cam and said eye pointed needle.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

CHARLES M. ABERGROMBIE.

Witnesses:

ABBIE M. D'ONIHEE, WILLIAM A. F LANAGAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

